There's a reason that the royal family is the one in control of the kingdom. Their bloodline is the one with the powers. Their line is associated with magic, or telepathy, or some other sort of supernatural ability. Sometimes this is the product of Superpowerful Genetics, other times it's an object passed down, or a ritual that the royals invoke that grants them their powers. Other times it is just handwaved as the Divine Right of Kings with a deity granting them their abilities, or just because Every Thing Is Better With Princesses. Examples of Royalty Super Power include: